304 



EXPERIMENT STATION RECX)BD 



Humulol from bops, (31) 3U. 

 Humulus lupuJus, sterile dwarfs in, (31) 130, 332. 

 Humus- 

 acids— 



and rolloids of, (33) 609. 



rtuniislry of. (26) 123. 



ertccl on soil bacteria, (31) 521. 



of Sphapnmu turf, (27) 322. 



review ofliterature, (28) 119. 



studies, (2<;) 720; (29) 124; (3.5) 628. 

 action of neutral sails on, (39) 614. 

 analyses, C.ir^) 128. 



as afTected by crop rotation, (27) 821. 

 guide to soil fertility, (37) 718. 

 source of carbon for Kreen plants, (35) 131. 

 source of energy in nitrogen fixation, (32) 516. 

 assimilation by higher i)lants, (27) 26. 

 chemistry of, (30) 122. 

 chlorin index, (40j 619. 

 colloid chemistry, (27) 417; (32) 813. 

 constituents, (27) .'•■OO; (28) 29. 

 determination, (28) 19; (30) 205. 

 determination in soils, (26) 406; (27) 496, 499; 

 (28) 123. 203. 204, 312; (29) 718, 796; (31) 110, 

 111; (33) 205; (34) 806; (35) 513; (36) 614. 

 distribution in Palifornia soils, (28) 197; (29) 



415. 

 effect on— 



availibility of pliosphoric acid, (26) 321. 



Azotobacter, (38) 329. 



nitrogen assimilation, (31) 120. 



plant Krowth, (29) 417. 



sandv ,=;oils, (31) 732. 



solubility of phonolito, (29) 319. 



weathering of silicates, (28) 322. 

 extract, effect in water culture, (28) 817. 

 fertilizing value, judging, (37) 216. 

 forest, effect on t)lant growth, (32) 618. 

 forest, use in agriculture, (29) 622. 

 formation, (35) 627; (36) 115; (.38) 26,27,720. 

 formation — 



and decomposition, (31) 120. 



from sugar, (34) 515. 



from vegetable compounds, (34) 516, 619. 



in soils. (34) 811. 



of black material of, (30) 28. 

 forming materials, effect on soil bacteria, (37) 



120. 

 forming substances, role in soil absorption, (32) 



319. 

 function in cultivated soils, (26) 422. 

 importance of, (31) 215. 

 in California soils, (30) 714; (34) 324. 

 dark soils, (33) 720. 

 Hawaiian soils, studies, (27) 7. 

 mulched basins, (38) 814. 

 soils, nature and maintenance, (30) 695. 

 loss from soils, (28) 217. 

 nature of, theories concerning, (32) 718. 

 nitrogen, and carbon ratios in soils, (28) 217. 

 notes, (37) 629. 



of acid and alkaline peats, (30) 715. 

 of arid soils, nitrogen content, (34) 719. 

 of loess soils, (34) 806; (35) 511. 

 phosphoric acid of soils, (37) 121. 

 problem in dry farming, (28) 322. 

 production from manures, (37) 20. 

 relation to — 



bacteria, (28) 727. 



soil bacteria, (32) 721. 



soil fertility, (36) 723; (38) 421. 

 review of investigations, (28) 518. 

 role in plant nutrition, (36) 31. 

 silicate, fertilizing value, (34) 19. 

 soils as affected by fertilizers, (28) 520. 

 soluble, effect on soil bacteria, (37) 517. 

 studies, (28) 203; (36) 512, 815. 

 substances, effect on weathering of silicates, (29) 



123. 

 sugar, preparation, (36) 625. 

 sugar, relation to soil "sickness," (28) 520. 

 Hunger- 

 control in health and disease, treatise, (36) 363. 

 nature of, (33) 566. 

 sensation of, (28) 864. 

 studies, (37) 166; (40) 270. 

 theories concerning, (27) 270. 

 Hunterellus hookeri — 

 life history, (26) 863. 

 notes, (37) 360. 



Hunting, review of literature, (27) 845; (30) 238; (33), 



49. 

 Hurricane — 



at Pensacola, Fla., (26) 214. 



Pacific, of .September, 1915, (34) 413. 



tracks, 1912-1915, (36) 419. 



tropical, in Louisiana, (34) 413; (38) 511. 

 Hurricanes — 



effect on upper air current, (34) 413. 



in Jamaica, (34) 615. 



notes, (36) 19, 719. 



West Indian, (29) 120; (38) 812. 

 Hyacinth- 

 beans, yields, (39) 434. 



bulbs, culture experiments, (30) 145. 



bulbs, selection and planting, (30) 796. 



diseases, treatment, (35) 51. 



pollen, parasite of, (31) 641. 



yellow disease, notes, (27) 45; (40) 844. 

 Hyacinths— 



as affected by stimulants, (26) 731. 



nematodes affecting, (30) 448; (31) 450. 

 Hyadaphis— 



pastinacai^ new name for, (39) 657. 



umbellulariae n.sp., description, (26) 859. 

 Hyalodema evansii, notes, (27) 51. 

 Hyalomma aegyptium — 



hereditary infection in, (30) 460. 



notes, (29) 58. 



relation to Mediterranean coast fever, (34) 384 

 Hyalopeplus pellucidus. notes, (27) 155. 

 Hyalopsora polypodii, studies, (27) 46. 

 Hyalopterus— 



arimdinis— 



cat-tail as summer host, (37) 461. 

 on Rosaceae, (32) 848. 

 remedies, (40) 161. 



pruni in Egypt, (.38) 158. 



pruni, remedies. (32) 649. 

 Hyalopus geophilus n.sp., description, (33) 447. 

 Hybrid, graft, in apples, (30) 140. 

 Hybridization — see aho lireeding. Animal breeding, 

 Plant breeding, and specific animals and plants. 



and mutation as independent phenomena, 

 (32) 326. 



effect on maturity and yield in corn, (39) 31. 



effect on water requirements of plants, (33) 

 726. 



experiments with — 

 barley, (28) 431. 

 fruits, (28) 435. 

 rye and wheat, (30) 733. 

 strawberries, (29) 742. 

 tobacco, (27) 839. 



likeness and relationship in, (26) 365. 



mutations through, (33) 758. 



natural, in Betula, (39) 30. 



of animals in United States, (26) 163. 



role in evolution, (37) 432. 



spontaneous, in plants, (31) 823. 

 Hybridizing, analytical, paper on, (28) 570, 574. 

 Hybrids- 

 animal, bibliographv, (26) 163. 



animal, fertility of, (26) 163. 



equus, notes, (26) 269. 



first generation, variation in, (30) 328. 



graft, connecting threads in, (30) 433. 



graft, description, (27) 31; (30) 329, 740. 



graft, notes, (32) 726. 



pigeon-dove, sterility in (27) 769. 

 Hychlorite, toxicity, (39) 586. 

 Hydnum— 



coralloides, fruiting forms, (32) 341. 



coralloides, notes, (27) 653. 



septeutrionale, notes, (28) 56. 

 Hydracids, effect on starch, (26) 107. 

 Hydraecia micacea as a garden pest, (35) 853. 

 Hydraulic — 



computations, definitions and eqtiivalents, (28) 

 186. 



conversion tables and equivalents, (38) 187. 



development and equipment, treatise, (37) 287. 



ram, automatic, description, (27) 386. 



ram, development in Germany, (26) 893. 



ram, notes, (31) 291. 

 rams- 

 construction and operation, (34) 885. 

 for farm water supplies, (35) 294. 

 installation and operation, (27) 589; (32) 87. 

 investigations, (28) 683 



